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A dipole for 40 or 80 meters at 20 feet will radiate straight up, which
is OK if you are only interested in local communications. FYI miltary
NVIS communications useually takes place on 2-4 MHz at night and 5-7
MHz during the day.

At one house I lived in all I could put up was an 80 meter dipole at just
under 20 feet. The center was supported by two pieces of electrical pvc
type pipe. It had a good signal out to about 300 or so miles, and less at
other distances. Worked fine at the time to talk to some locals to 300
miles in the eairly mornings.

When limiated as to what you can do, just stick up something to start with
and later work on getting something beter.